Characterization of a tantalum capacitor fabricated with a conducting polypyrrole as a counter electrode

Satoh, Masaharu; Ishikawa, Hitoshi; Amano, K.; Hasegawa, Eiji; Yoshino, Katsumi

doi:10.1016/0379-6779(94)03249-6

Cited by 24 publications

(7 citation statements)

References 6 publications

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“…Tantalum pentoxide (Ta 2 O 5 ) is a versatile functional dielectric that can be used as electrolytic capacitor, optical modulator, optical coating, high‐K gate dielectric material in microelectronics, and the switching layer in memristors . Despite its wide range of applications, the knowledge of its exact structure is nevertheless still limited.…”

Section: Introductionmentioning

confidence: 99%

Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation

et al. 2019

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It is reported that the recently predicted triclinic γ -phase ground state Ta 2 O 5 by Yang and Kawazoe can be assigned a much more symmetric I4 1 /amd space group, and is isomorphic to P-Nb 2 O 5 . Interestingly, the well-known high temperature α-phase Ta 2 O 5 also has the I4 1 /amd symmetry, but is unstable at zero temperature according to our phonon dispersion calculation. A thorough energy comparison of the β AL , δ, λ, B, L SR , β R , Pm, Cmmm, γ , and α phases of Ta 2 O 5 is carried out using density functional theory under the generalized gradient approximation (GGA). The GGA-1/2 method is applied in calculating the electronic structure of various phases, where the tetragonal γ -phase demonstrates a 4.24 eV indirect band gap, close to experimental value. The high symmetry tetragonal phase together with computationally efficient GGA-1/2 method greatly facilitates the ab initio simulation of Ta 2 O 5 -based devices. As an example, the Ohmic contact nature between metal Ta and Ta 2 O 5 by calculating an interface model of b.c.c. Ta and tetragonal γ -Ta 2 O 5 , using GGA-1/2 has been explicitly shown.

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Section: Introductionmentioning

confidence: 99%

Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation

et al. 2019

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“…Another approach was to synthesize polypyrrole by a chemical oxidation route or electropolymerization in the presence of a stabilizer, resulting in sterically stabilized conducting polymer 4–10. Ishizu et al 11 synthesized polypyrrole microspheres by the oxidation of pyrrole monomer in various solvents in the presence of stabilizers such as poly(vinyl alcohol) and modified poly(vinyl alcohol) with pendent pyrrole groups.…”

Section: Introductionmentioning

confidence: 99%

In situ formed processable polypyrrole nanoparticle/amphiphilic elastomer composites and their properties

Lee¹,

Park²,

Wallace³

et al. 2004

Polymer International

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A lack of processability is one of the major problems associated with practical applications of conductive and electroactive polypyrrole. Polypyrrole nanoparticles that were sterically stabilized in a solution and supported by an amphiphilic elastomer of poly(ethylene glycol) (M n 2000 g mol −1 )/poly(tetramethylene ether glycol) (M n 2000 g mol −1 ) multiblock copolymer, were investigated in terms of conductivity, processability and mechanical properties. The hydrogel, amphiphilic elastomer was soluble in various organic solvents such as methanol, acetone and ethanol, but only swellable in water. The synthetic conditions of polypyrrole nanoparticles in the presence of the multiblock copolymer were optimized. The conductivity of polypyrrole film formed from the nanoparticle suspension was measured with the van der Pauw fourprobe method and reached as high as 3.0 ± 0.2 S cm −1 . The film also showed elastomeric properties, which were influenced by the amount of multiblock copolymer added during nanoparticle synthesis.

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“…They possess high electrical conductivity, excellent electroactivity and relatively high environmental stability. Since their discovery ICP's have been investigated for application in different electronic devices: rechargeable batteries, 1,2 and capacitors, 3 pH sensors and electrochromic devices, 4 selective membranes, 5 optoelectronic devices, 6 electromagnetic screens, 7 corrosion protection, 8 wetting agents for improving compatibility in composites with carbon fibers. 9,10 Preparation of composites with a chemically inert and mechanically stable matrix is the most effective way to improve the mechanical properties and environmental stability of ICP's.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of a composite of polyimide and polypyrrole

Levine

Iroh

2001

J. Mater. Chem.

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Conducting composites composed of polypyrrole (PPy) and polyimide (PI) have been successfully synthesized by electrochemical oxidative polymerization of pyrrole in a PI matrix. The PPy-PI composite has higher permeability to ions than a PPy-poly(amic acid) composite. The charge storage ability of the PPy-PI composite was found to be higher than those for PPy film and for a PPy-poly(amic acid) composite containing the same amount of PPy. This behavior may be due to the intrinsic electroactivity of the PI matrix and the high permeability of PI to ions during the electrochemical process. This makes composites containing conducting polymer as a filler and PI as a matrix to be a promising candidate for charge storage devices application.

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Characterization of a tantalum capacitor fabricated with a conducting polypyrrole as a counter electrode

Cited by 24 publications

References 6 publications

Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation

Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation

In situ formed processable polypyrrole nanoparticle/amphiphilic elastomer composites and their properties

Electrochemical behavior of a composite of polyimide and polypyrrole

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Characterization of a tantalum capacitor fabricated with a conducting polypyrrole as a counter electrode

Cited by 24 publications

References 6 publications

Ab Initio Simulation of Ta2O5: A High Symmetry Ground State Phase with Application to Interface Calculation

Ab Initio Simulation of Ta2O5: A High Symmetry Ground State Phase with Application to Interface Calculation

In situ formed processable polypyrrole nanoparticle/amphiphilic elastomer composites and their properties

Electrochemical behavior of a composite of polyimide and polypyrrole

Contact Info

Product

Resources

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Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation

Ab Initio Simulation of Ta₂O₅: A High Symmetry Ground State Phase with Application to Interface Calculation